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Ready reckoner (currency)

1972-1976

Globetrotter Series ready reckoner calculating rule for mileage between European cities and currency conversion

1965-1972

One of four ready reckoners

1972-1976
Double Slide Rule (dated 1815), inscribed on one side EXCHANGES BULLION ETC; PULISHED BY W.CARY - 182 STRAND, APR.1.1815; on other side WEIGHTS AND MEASURES AND COINS; PUBLISHED BY W. CARY - 182 STRAND, APR.24.1.1815. Printed on paper, varnished and mounted on mahogany

Double Slide Rule (dated 1815)

1815-1820
One of four ready reckoners, for assisting the conversion from L.s.d. to decimal currency, sponsored by the Daily Telegraph newspaper. A circular plastic dial with moveable cursor.

One of four ready reckoners

1972-1976